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The operation of the compact muon solenoid drift tubes (DTs) muon detectors at the high-luminosity large hadron collider will be possible only with an upgrade of the current readout and trigger electronics, which are based on very old technology and directly exposed to radiation, hence particularly sensitive to aging. A new level 1 trigger primitive generator, based on the use of an original compact Hough transform (CHT) algorithm, is being designed with the goal of its implementation in the state-of-the-art field programmabla gate array (FPGA) devices. The algorithm can identify the muon track segment parameters and must be combined with a majority mean-timer in order to assign the muon to its parent bunch crossing. The algorithm is expected to be deployed on FPGAs and has a few \mu \texts latency for decision taking, with efficiency and resolution equal or higher with respect to the ones provided by the currently running algorithm. The major challenges are parallelization of the algorithm, fast readout of the CHT parameter matrix, the capability of handling data from a large array of DTs in the minimal number of FPGAs, and coping with the latency requirements. These issues will be addressed proposing constructive solutions. [ABSTRACT FROM AUTHOR]

Telescopes of position sensitive detectors are common layouts in charged particles tracking, and programmable logic devices, such as FPGAs, represent a viable choice for the real-time reconstruction of track segments in such detector arrays. A compact implementation of the Hough Transform for fast triggers in High Energy Physics, exploiting a parameter reduction method, is proposed, targeting the reduction of the needed storage or computing resources in current, or next future, state-of-the-art FPGA devices, while retaining high resolution over a wide range of track parameters. The proposed approach is compared to a Standard Hough Transform with particular emphasis on their application to muon detectors. In both cases, an original readout implementation is modeled. [ABSTRACT FROM AUTHOR]

A thin silicon diode formed by a deep p+ implantation under a shallow n+ one is proposed as a solid state micro- dosimeter. The thickness of the sensitive layer of the tested device is about two micrometers and the active area is about 10 mm². Due to the very large electric capacitance of the diode (about 1 nF) a low noise read-out circuit based on a discrete JFET has been developed. The noise due to the parasitic resistance of the detector itself dominates and fixes the lower threshold of the energy spectrum. A prototype of the proposed microdosimeter covered with a polyethylene converter has been irradiated with fast monoenergetic neutrons at the INFN-Legnaro Labs (I). The first experimental spectra are in good agreement with the simulated ones. The effect of direct inter- actions of thermal neutrons in silicon has been measured. [ABSTRACT FROM AUTHOR]

The feasibility of the discrimination between protons and secondary electrons was investigated in order to decrease the lower limit of a recoil-proton spectrometer for neutrons based on a silicon p-i-n diode. The simulation of the ionization generated in the detector by protons and electrons and the simulation of the relevant induced currents show that such discrimination is feasible provided that the "rear side injection" configuration and a low noise setup are adopted. The difference between the collecting times of the two pulses is maximized and used for the rising time based discrimination. The neutron spectrometer consists of a 3 mm² area, 300 μm-thick silicon p-i-n diode covered with a polyethylene foil on the n-side. The ENC is 720 rms electrons at 20 us shaping time. Experimental results on monoenergetic neutrons show the effectiveness of this discrimination in decreasing the lower limit of the recoil proton energy spectrum from 1.1 to 0.6 MeV. [ABSTRACT FROM AUTHOR]